REFRIGERATING MACHINE OIL COMPOSITION AND REFRIGERATING MACHINE SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a refrigerating machine oil composition that can be used in a refrigerating machine system using a refrigerant comprising a mixture of an unsaturated fluorohydrocarbon compound, a saturated fluorohydrocarbon compound and CO, which is a refrigerant having a low global warming potential and is usable in particular for a car air conditioner or the like, and has excellent compatibility with the refrigerant and excellent stability.SOLUTION: The refrigerating machine oil composition is used for a refrigerant comprising a mixture of an unsaturated fluorohydrocarbon compound, a saturated fluorohydrocarbon compound and CO. The refrigerating machine oil composition contains a base oil comprising at least one kind selected from polyoxyalkylene glycols, polyvinyl ethers, a copolymer of a poly(oxy)alkylene glycol or a monoether thereof with a polyvinyl ether and polyol esters and having a kinematic viscosity at 100°C of not less than 2 mm/s to not more than 50 mm/s and a hydroxyl value of not more than 5 mgKOH/g.